CASIO fx-4000P scientific calculator

This powerful pocket calculator was manufactured in Japan after 1986 week 43 according to the most recent chip found in the PCA.

The year is 1985. Casio released this model with a impressive set of features for its time:

• Re-configurable RAM memory partitioning. Default as 26 x 8-byte Registers and 550 programming steps
• Fully merged programming model. 
• Conditional and unconditional jumps, subroutines.
• Support for indirect register addressing. Arrays.
• User friendly programming environment. Keystrokes displayed by its names. Easy editing and debugging.  
• Alphanumeric capability

 

Calculator forensics: arcsin(arccos(arctan(tan(cos(sin(9)))))) =  8.999686999
 

Remaining digits: 9 - Ans Exe x 10000000 =  31.3001

5x7 dot matrix LCD display, user friendly algebraic input.

Friendly program editor.
Keystrokes displayed by its function names.
Left and right cursors allows easy editing.
Program memory usage updated in real time at the top right.

Dot matrix LCD display with full contrast ON to show all elements.

Accessing the battery compartment.
It uses two CR2032 in series for a total of 6Volt at 1.7mA average current consumption.

Dismantling.

SoC processor: Hitachi HD61747B38  6J 43  (1986 week 43)
Memory: HD61914 8kbit static RAM  6K33 (1986 week 33)
This is the same PCA as used on the FC-200 financial calculator, but using a different firmware.